mirror of
https://github.com/boostorg/describe.git
synced 2026-01-19 04:12:07 +00:00
126 lines
2.3 KiB
C++
126 lines
2.3 KiB
C++
// Copyright 2022 Peter Dimov
|
|
// Distributed under the Boost Software License, Version 1.0.
|
|
// https://www.boost.org/LICENSE_1_0.txt
|
|
|
|
#if defined(__GNUC__) && __GNUC__ == 12
|
|
# pragma GCC diagnostic ignored "-Wrestrict" // false positive
|
|
#endif
|
|
|
|
#include <boost/describe.hpp>
|
|
#include <boost/mp11.hpp>
|
|
#include <boost/core/type_name.hpp>
|
|
#include <string>
|
|
#include <ostream>
|
|
|
|
namespace detail
|
|
{
|
|
|
|
template<class T1, class T2>
|
|
constexpr auto equals( T1 t1, T2 t2, int ) -> decltype( t1 == t2 )
|
|
{
|
|
return t1 == t2;
|
|
}
|
|
|
|
template<class T1, class T2>
|
|
constexpr bool equals( T1 /*t1*/, T2 /*t2*/, long )
|
|
{
|
|
return false;
|
|
}
|
|
|
|
using namespace boost::describe;
|
|
|
|
template<class T, class C,
|
|
class L = describe_members<C, mod_any_access | mod_any_member>>
|
|
char const* get_member_name( T C::* pm, int )
|
|
{
|
|
char const * name = nullptr;
|
|
|
|
boost::mp11::mp_for_each<L>([&](auto D){
|
|
|
|
if( equals( D.pointer, pm, 0 ) ) name = D.name;
|
|
|
|
});
|
|
|
|
return name;
|
|
}
|
|
|
|
template<class T, class C>
|
|
char const* get_member_name( T C::* /*pm*/, long )
|
|
{
|
|
return nullptr;
|
|
}
|
|
|
|
} // namespace detail
|
|
|
|
template<class T, class C>
|
|
std::string pm_to_string( T C::* pm )
|
|
{
|
|
char const * name = ::detail::get_member_name( pm, 0 );
|
|
|
|
if( name == nullptr ) name = "(unknown)";
|
|
|
|
return "&" + boost::core::type_name<C>() + "::" + name
|
|
+ " [" + boost::core::type_name<T>() + "]";
|
|
}
|
|
|
|
template<class T, class C>
|
|
std::ostream& operator<<( std::ostream& os, T C::* pm )
|
|
{
|
|
os << pm_to_string( pm );
|
|
return os;
|
|
}
|
|
|
|
struct X
|
|
{
|
|
int m;
|
|
int f() const { return m; }
|
|
};
|
|
|
|
BOOST_DESCRIBE_STRUCT(X, (), (m, f))
|
|
|
|
struct Y: public X
|
|
{
|
|
int m;
|
|
int g() const { return -m; }
|
|
};
|
|
|
|
BOOST_DESCRIBE_STRUCT(Y, (X), (m, g))
|
|
|
|
struct Z
|
|
{
|
|
void h() {}
|
|
};
|
|
|
|
#if !defined(_MSC_VER) || defined(__clang__)
|
|
|
|
// MSVC doesn't support BOOST_DESCRIBE_CLASS inside
|
|
// templates until 2022 in C++20 mode
|
|
|
|
template<class T1, class T2> struct pair
|
|
{
|
|
T1 first;
|
|
T2 second;
|
|
|
|
BOOST_DESCRIBE_CLASS(pair, (), (first, second), (), ())
|
|
};
|
|
|
|
#endif
|
|
|
|
#include <iostream>
|
|
|
|
int main()
|
|
{
|
|
std::cout << &X::m << std::endl;
|
|
std::cout << &X::f << std::endl;
|
|
|
|
std::cout << &Y::m << std::endl;
|
|
std::cout << &Y::f << std::endl;
|
|
std::cout << &Y::g << std::endl;
|
|
|
|
std::cout << &Z::h << std::endl;
|
|
|
|
#if !defined(_MSC_VER) || defined(__clang__)
|
|
std::cout << &pair<int, float>::second << std::endl;
|
|
#endif
|
|
}
|